We expect that short trains of TMS will affect IHC depending on whether the pulses are synchronous or asynchronous. By modulating IHC, we expect changes in object discrimination task performance. The primary outcome measure in this study includes object discrimination task performance. During the study, we will also compute the individual frequency at which maximum coherence occurs, the threshold intensity and optimal coil direction for blocking object discrimination and the spatio-temporal characteristics of EEG waves during the rTMS trains to confirm that entrainment is occurring.